I quit years ago and I still get the urge when I smell cigarette smoke. We learn to live with it..... literally. After just a few years you will have the healthy life expectancy of a non-tobacco addict. Consider that while you are counting sheep!
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As for getting to sleep, there's nothing like a slightly tired body to help you nod off on schedule. So, get some daily exercise. If you can afford it, go to a health club and schedule several sessions a week with a trainer. A warm bath with a book or music might be a good idea too, and there's always the old standby, warm milk.... it really does work, you know.
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Alcohol, forget it beyond, perhaps, a short glass of wine.
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My wife's technique, weird as it may sound, is to lay quietly in bed and concentrate on keeping her eyes open! She says it gets harder and harder till she finally gives up and drifts off to dreamland.
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Something will work for you too. Just relax and let it happen.
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